CN111455833A - Self-resetting prefabricated assembled pier and construction method thereof - Google Patents
Self-resetting prefabricated assembled pier and construction method thereof Download PDFInfo
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- CN111455833A CN111455833A CN202010291463.3A CN202010291463A CN111455833A CN 111455833 A CN111455833 A CN 111455833A CN 202010291463 A CN202010291463 A CN 202010291463A CN 111455833 A CN111455833 A CN 111455833A
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- 210000002435 tendon Anatomy 0.000 claims abstract description 117
- 238000005265 energy consumption Methods 0.000 claims description 59
- 238000004873 anchoring Methods 0.000 claims description 35
- 239000011083 cement mortar Substances 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 238000009417 prefabrication Methods 0.000 claims description 2
- 230000008439 repair process Effects 0.000 abstract description 3
- 239000004567 concrete Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
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- 239000010959 steel Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
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- 238000001125 extrusion Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
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- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
Abstract
The invention relates to the technical field of bridge engineering and discloses a self-resetting prefabricated assembled pier and a construction method thereof, wherein the self-resetting prefabricated assembled pier comprises a prefabricated pier stud and a foundation bearing platform, and also comprises a first prestressed tendon and an energy-consuming connecting piece; the bottom of the prefabricated pier stud is connected with the foundation bearing platform through the first prestressed tendons and the energy-consuming connecting pieces respectively to form a whole. The assembled pier has the advantages of simple structure, convenience and quickness in operation and high construction efficiency, the assembled pier after construction has self-resetting property and good overturn resistance, the problem that the pier corner part of the conventional assembled pier is easy to damage and break due to stress concentration is effectively solved, and the damaged part is easy to repair.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a self-resetting prefabricated assembled pier and a construction method thereof.
Background
In recent years, traffic infrastructure, especially high-speed railways, highways, and urban expressways have been rapidly developed, and among them, bridge engineering has been a dominant position. The huge construction requirements put higher demands on the construction quality and the construction efficiency of bridge engineering. The prefabricated and assembled bridge structure can obviously improve the construction efficiency and ensure the construction quality by adopting a standardized and modularized construction mode, and has the advantages of less interference to the existing traffic, greenness, environmental protection and the like, thereby being widely popularized and applied and being very suitable for the construction of bridge engineering.
At present, in the application aspect of prefabricated assembled bridges, research and application practice of prefabricated assembled piers on the lower sides of the bridges are still in a starting stage, and the application of the prefabricated assembled piers is mainly focused on river-crossing and sea-crossing bridges in low-intensity earthquake defense areas and urban bridges.
However, for a high-intensity earthquake defense area, the existing assembled pier has poor anti-overturning performance, the existence of a joint of a splicing structure between a pier body and a bearing platform of the assembled pier causes weak lateral restraint of the prefabricated assembled pier, the transverse sliding is easy to occur under the action of an earthquake, and the problem that the pier corner part of the pier is damaged and broken due to stress concentration is caused.
Disclosure of Invention
The embodiment of the invention provides a self-resetting prefabricated assembled pier and a construction method thereof, which are used for solving the problems that the existing assembled pier is poor in anti-overturning performance, and a pier corner part is easy to damage and break due to stress concentration.
In order to solve the technical problem, an embodiment of the present invention provides a self-resetting prefabricated assembled pier, including a prefabricated pier stud and a foundation bearing platform, and further including: the first prestressed tendon and the energy-consuming connecting piece; the bottom of the prefabricated pier stud and the foundation bearing platform are respectively connected into a whole through the first prestressed tendons and the energy-consuming connecting pieces.
The prefabricated pier column comprises a plurality of prefabricated pier columns, a carrying structure is arranged on the upper side of each prefabricated pier column, and the top of each prefabricated pier column and the carrying structure are connected into a whole through the first prestressed tendons and the energy-consuming connecting pieces respectively; and/or, second prestressed tendons arranged along the long side direction of the prefabricated pier column are arranged in the prefabricated pier column, and the prefabricated pier column comprises a plurality of prefabricated sections.
One end of the first prestressed tendon is anchored on the prefabricated pier stud, the other end of the first prestressed tendon passes through the foundation bearing platform and is anchored on the side surface of the foundation bearing platform, or the two ends of the first prestressed tendon are both anchored on the prefabricated pier stud, and at least one section of the middle part of the first prestressed tendon is positioned in the foundation bearing platform.
The prefabricated pier stud is characterized in that a foot seat is arranged at the bottom of the prefabricated pier stud, the foot seat is connected with the foundation bearing platform through a plurality of energy-consuming connecting pieces, and the plurality of energy-consuming connecting pieces are distributed in a centrosymmetric manner along the vertical center line of the prefabricated pier stud; the two ends of the first prestressed tendon are anchored on the upper surface of the foot seat, and the middle part of the first prestressed tendon is positioned in the foundation bearing platform.
Wherein, still include: a first pre-buried pipeline; the first embedded pipeline comprises a first straight line section, a U-shaped section and a second straight line section, the first straight line section and the second straight line section are pre-embedded in the foot seats, the U-shaped section is embedded in the foundation bearing platform, two ends of the U-shaped section are located on the upper surface of the foundation bearing platform, the upper ends of the first straight line section and the second straight line section are located on the upper surface of the foot seats, and the lower ends of the first straight line section and the second straight line section are located on the lower surface of the foot seats and respectively correspond to two ends of the U-shaped section; the first prestressed tendons are unbonded prestressed tendons, the first prestressed tendons penetrate through the first embedded pipeline, and the two ends of the first prestressed tendons extend out of the two ends of the first embedded pipeline and are anchored on the upper surface of the foot base.
Wherein, still include: the second embedded pipelines are distributed along the long side direction of the prefabricated pier stud; the second embedded pipeline is integrally embedded in the prefabricated pier stud, or the second embedded pipeline comprises a plurality of sections and is respectively embedded in each prefabricated section; the second prestressed tendons are provided with bonding prestressed tendons, the second prestressed tendons penetrate through the second embedded pipeline, and cement mortar is filled between the second prestressed tendons and the second embedded pipeline.
The energy consumption connecting piece comprises energy consumption rods, the energy consumption rods are vertically arranged, the upper ends of the energy consumption rods are connected with the foot seats, and the lower ends of the energy consumption rods are connected with the foundation bearing platform.
Wherein, still include: the fixing base plate, the third embedded pipeline and the anchoring piece; the fixed base plate is pre-buried on the upper surface of the foot seat, the third pre-buried pipeline is vertically pre-buried in the foot seat, and the anchoring piece is pre-buried in the foundation bearing platform; the diameter of the energy consumption rod is smaller than the inner diameter of the third embedded pipeline and is inserted into the third embedded pipeline, the upper end of the energy consumption rod is connected with the fixed base plate, and the lower end of the energy consumption rod is in threaded connection with the anchoring piece.
The energy consumption rod is characterized in that the fixed backing plate is provided with a thread sunken groove, the thread sunken groove is in threaded connection with the brim of the fixed cap, and the upper end of the energy consumption rod extends out of the upper side of the fixed backing plate and is abutted against the top of the fixed cap.
The embodiment of the invention also provides a construction method of the self-resetting prefabricated assembled pier, which comprises the following steps: s1, preparing prefabricated pier studs and foundation bearing platforms; s2, hoisting the prefabricated pier stud on a foundation bearing platform, ensuring that a first straight line section and a second straight line section of the first embedded pipeline respectively correspond to two ends of a U-shaped section of the first embedded pipeline, and ensuring that the lower end of a third embedded pipeline corresponds to an anchoring piece; s3, penetrating the first prestressed tendons into the first embedded pipeline, extending the two ends of the first prestressed tendons out of the two ends of the first embedded pipeline and anchoring the first prestressed tendons on the fixing base plate, inserting the energy consumption rods into the third embedded pipeline, connecting the lower ends of the energy consumption rods with anchoring parts in a threaded mode, and fastening the upper ends of the energy consumption rods on the fixing base plate.
Wherein S2 further includes: penetrating a second prestressed tendon into a second embedded pipeline of the prefabricated section at the bottommost part of the prefabricated pier column in advance, anchoring the lower end of the second prestressed tendon, and hoisting the prefabricated section on a foundation bearing platform;
s3 further includes: and (3) upwards installing other prefabricated sections of the prefabricated pier column layer by layer in sequence, injecting cement mortar into the second embedded pipe after the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, and anchoring the upper end of the second prestressed tendon at the top of the prefabricated pier column.
One or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:
according to the self-resetting prefabricated assembled pier provided by the embodiment of the invention, the bottom of the prefabricated pier stud and the foundation bearing platform are connected into a whole through the first prestressed tendons, so that when the prefabricated pier stud moves or swings under the action of an earthquake, corresponding prestress can be applied to the bottom of the prefabricated pier stud, the prefabricated pier stud is quickly self-reset to an initial position, the residual deformation of the corresponding structural part of the prefabricated pier stud is greatly reduced, and the self-resetting prefabricated assembled pier stud has better anti-overturning property; meanwhile, the connecting capacity and the energy consumption capacity between the bottom of the prefabricated pier stud and the foundation bearing platform are further improved through the energy consumption connecting piece, the problem that the pier corner part of the prefabricated pier stud is damaged and broken due to stress concentration is effectively solved, stress loss caused by local extrusion of a concrete structure at the bottom of the prefabricated pier stud is correspondingly reduced, the prefabricated pier stud is supported to swing with a larger turning radius under the cooperation of the first prestressed ribs, and the anti-overturning capacity of the assembled pier is further enhanced.
According to the construction method based on the self-resetting prefabricated assembled pier, during construction, only the prefabricated pier stud and the foundation bearing platform are required to be prepared in advance, then the prefabricated pier stud is hung on the foundation bearing platform in a construction site, and finally the installation of the first prestressed tendons and the energy-consuming connecting pieces is finished correspondingly. Whole construction process simple operation, the efficiency of construction is high, and the pier of assembling of accomplishing of construction has from restoring to the throne nature, and antidumping nature is good, has effectively solved the easy broken problem of damage because of stress concentration in the present pier angle position of assembling the pier to easily restore damaged position.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic front view structural diagram of a first structure of a self-resetting prefabricated assembled pier according to an embodiment of the invention;
fig. 2 is a schematic front view structural diagram of a second structure of the self-resetting prefabricated assembled pier, according to the embodiment of the invention;
fig. 3 is a schematic front view structure view of a third structure of a self-resetting prefabricated assembled pier according to an embodiment of the invention;
fig. 4 is a schematic view of a partial structure in which the foot stool and the base platform are connected by the first tendon and the energy-consuming connector, respectively, according to the embodiment of the present invention;
FIG. 5 is a schematic top view of a fixing pad according to an embodiment of the present invention;
FIG. 6 is a bottom view of the fixed bolster according to the embodiment of the present invention;
fig. 7 is a schematic structural view illustrating a structure of a fixing pad plate and an embedded bolt when the fixing pad plate is embedded in the upper surface of a foot base according to an embodiment of the present invention;
fig. 8 is a flowchart of a construction method based on a self-resetting prefabricated assembled pier according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a specific construction process of a self-resetting precast assembled pier according to an embodiment of the present invention.
In the figure: 1. prefabricating a pier stud; 2. a base platform; 3. a first tendon; 4. a second tendon; 5. a first pre-buried pipeline; 6. a second pre-buried pipeline; 7. prefabricating a cover beam; 8. a foot seat; 9. an energy-consuming connector; 91. an energy consumption bar; 92. fixing the base plate; 921. a first through hole; 922. a first thread sink; 923. a threaded counter bore; 924. a second through hole; 925. a second thread sink; 93. embedding bolts in advance; 94. a third pre-buried pipeline; 95. pre-burying a joint; 96. an anchoring head; 97. locking the nut; 98. a first fixing cap; 99. a second locking cap.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 2, the embodiment provides a self-resetting prefabricated assembled pier, which includes a prefabricated pier stud 1, a foundation bearing platform 2, a first prestressed tendon 3 and an energy-consuming connector 9; the bottom of the prefabricated pier stud 1 is connected with the foundation bearing platform 2 through the first prestressed tendons 3 and the energy-consumption connecting pieces 9 respectively to form a whole.
Specifically, the self-resetting prefabricated assembled pier shown in the embodiment is characterized in that the bottom of the prefabricated pier stud 1 and the foundation bearing platform 2 are connected into a whole through the first prestressed tendons 3, so that when the prefabricated pier stud 1 moves or swings under the action of an earthquake, corresponding prestress can be applied to the bottom of the prefabricated pier stud 1, the prefabricated pier stud 1 can be quickly self-reset to an initial position, the residual deformation of a corresponding structural part of the prefabricated pier stud 1 is greatly reduced, and the self-resetting prefabricated assembled pier has good anti-overturning performance; meanwhile, the connecting capacity and the energy consumption capacity between the bottom of the prefabricated pier stud 1 and the foundation bearing platform 2 are further improved through the energy consumption connecting piece 9, the problem that the pier corner part of the prefabricated pier stud 1 is damaged and broken due to stress concentration is effectively solved, stress loss caused by local extrusion of a concrete structure at the bottom of the prefabricated pier stud 1 is correspondingly reduced, and the prefabricated pier stud 1 is supported to swing with a larger turning radius under the matching of the first prestressed ribs 3, so that the anti-overturning capacity of the assembled pier is enhanced.
It should be noted that fig. 1 is a schematic front view of a first structure of a self-resetting precast pier assembly shown in this embodiment. In fig. 1, the prefabricated pier stud 1 comprises a plurality of prefabricated segments, and the prefabricated segments are aligned with end faces along the vertical center line of the prefabricated pier stud 1 and are spliced into a whole in a vertically stacked manner. Fig. 2 is a schematic front view of a second structure of a self-resetting prefabricated pier assembly shown in the present embodiment, and the difference between fig. 2 and the pier assembly shown in fig. 1 is that the prefabricated pier 1 shown in fig. 2 is an integrated structure. In actual construction, in order to reduce the construction degree of difficulty, preferably prefabricated pier stud 1 is the structure of assembling of a plurality of prefabricated segments.
Meanwhile, a plurality of prefabricated pier studs 1 can be arranged, the bottom of each prefabricated pier stud 1 is connected with a corresponding foundation bearing platform 2 through the first prestressed tendons 3 and the energy-consuming connecting pieces 9 respectively to form a whole, and the upper side of the prefabricated pier stud 1 is provided with a carrying structure, which can be a prefabricated capping beam known in the art, thereby the top of the prefabricated pier stud 1 and the prefabricated capping beam 7 are respectively connected into a whole through the first prestressed tendons 3 and the energy-consuming connecting pieces 9, wherein a plurality of prefabricated pier columns 1 are simultaneously connected with a prefabricated capping beam 7 to form an integrated structure, and a self-resetting prefabricated assembled pier with a third structure shown in figure 3 is formed, in fig. 3, two prefabricated piers 1 are specifically provided, the bottoms of the two prefabricated piers 1 are respectively installed on a corresponding foundation cap 2, and the tops of the two prefabricated piers 1 are jointly installed with a prefabricated capping beam 7. Wherein, each prefabricated segment of the prefabricated pier stud 1, the foundation bearing platform 2 and the prefabricated capping beam 7 can adopt a reinforced concrete structure known in the art.
For the specific arrangement of the first prestressed tendons 3, it is preferable that the first prestressed tendons 3 can simultaneously penetrate through the prefabricated pier stud 1 and the foundation pile cap 2, so that the first prestressed tendons 3 have a good stress conduction effect, and therefore, when the prefabricated pier stud 1 moves transversely or swings under the action of an earthquake, the prefabricated pier stud can be automatically restored to an initial position under the stress effect of the first prestressed tendons 3.
In one preferred embodiment, one end of the first tendon 3 may be anchored to the prefabricated pier stud 1, and the other end of the first tendon 3 passes through the foundation bearing platform 2 and is anchored to the side surface of the foundation bearing platform 2, so that the stress generated on the first tendon 3 is favorably transmitted to the foundation bearing platform 2, thereby greatly enhancing the lateral strength of the prefabricated pier stud 1, ensuring the self-resetting property and the anti-overturning property of the prefabricated pier stud 1, anchoring the other end of the first tendon 3 to the side surface of the foundation bearing platform 2, and facilitating the damage detection after the earthquake of the anchoring part, and facilitating the repair of the damage.
In another preferred embodiment, both ends of the first tendon 3 may be anchored to the prefabricated pier stud 1, and at least one section of the middle portion of the first tendon 3 is located in the foundation cap 2, so that on the basis of conveniently transferring the stress generated on the first tendon 3 to the foundation cap 2, the length of the first tendon 3 is conveniently increased in a limited structural space as much as possible, thereby further enhancing the lateral strength of the prefabricated pier stud 1, ensuring the self-restoring property and the anti-overturning property of the prefabricated pier stud 1, and simultaneously, both ends of the first tendon 3 are anchored to the prefabricated pier stud 1, thereby greatly facilitating the site anchoring construction of workers and the subsequent maintenance operation of the anchoring portion.
By dissipative connector 9, it is understood an elastic connection element with a certain rigidity, known in the art, such as: shear bar, steel plate, etc. The energy-consuming connecting piece 9 is used as an auxiliary connection between the bottom of the prefabricated pier stud 1 and the foundation bearing platform 2, and can be vertically arranged on the outer side surface or inside of the splicing structure of the prefabricated pier stud 1, and is not specifically limited herein, of course, in order to achieve a good energy-consuming effect, the energy-consuming connecting piece 9 is preferably vertically arranged inside the splicing structure between the bottom of the prefabricated pier stud 1 and the foundation bearing platform 2, so that when the prefabricated pier stud 1 moves transversely or swings under the action of an earthquake, the concrete structure at the bottom of the prefabricated pier stud 1 is effectively prevented from being directly in rigid contact with the foundation bearing platform 2, and the problem that the pier corner part of the prefabricated pier stud 1 is damaged and broken due to stress concentration is effectively prevented.
The prefabricated pier stud 1 can be of a solid concrete structure or a hollow concrete structure, when the prefabricated pier stud 1 is of a solid concrete structure, the cross section of the prefabricated pier stud can be circular, oval, rectangular or oval, and when the prefabricated pier stud 1 is of a hollow concrete structure, the cross section of the prefabricated pier stud can be correspondingly of a hollow circular, oval, rectangular or oval, so that the weight of the prefabricated pier stud 1 can be greatly reduced on the premise of ensuring the overall mechanical strength of the prefabricated pier stud 1.
Meanwhile, the prefabricated pier stud 1 is internally provided with second prestressed tendons 4 arranged along the long edge direction of the prefabricated pier stud, one end of each second prestressed tendon 4 is anchored at the top of the prefabricated pier stud 1, and the other end of each second prestressed tendon 4 is anchored in a sunken groove at the bottom of the prefabricated pier stud 1. The second pre-stressed tendons 4 can be arranged in a plurality of numbers, and the plurality of second pre-stressed tendons 4 are distributed in the prefabricated pier stud 1 along the vertical central line of the prefabricated pier stud 1 in a central symmetry manner, so that the prefabricated pier stud 1 can have relatively close lateral strength in different directions, and has enough rigidity to ensure the self-resetting property and the anti-overturning property of the prefabricated pier stud 1.
In one preferred embodiment, second embedded pipelines 6 arranged along the long side direction of the prefabricated pier column 1 can be arranged in the prefabricated pier column; when the prefabricated pier stud 1 is of an integrated structure, the second embedded pipeline 6 is arranged to be integrated and pre-embedded in the prefabricated pier stud 1, and when the prefabricated pier stud 1 is of an assembled structure with a plurality of prefabricated sections, the second embedded pipeline 6 correspondingly comprises a plurality of sections and is pre-embedded in each prefabricated section respectively, wherein the second embedded pipeline 6 in the adjacent prefabricated sections can play a good positioning role, so that the prefabricated sections of each layer of the prefabricated pier stud 1 can be assembled from top to bottom in sequence, and the efficiency of field assembly construction can be improved; here, the second prestressed tendons 4 are bonded prestressed tendons, the second prestressed tendons 4 penetrate through the second embedded pipeline 6, and cement mortar is filled between the second prestressed tendons 4 and the second embedded pipeline 6. So, through cohering second prestressing tendons 4 with second embedded pipeline 6 with cement mortar and constitute integral type prestressed construction, strengthened the holistic tensile strength of this integral type prestressed construction to also strengthened prefabricated pier stud 1 correspondingly from restoring to the throne nature and the antidumping nature.
Further, in the embodiment, the foot seats 8 are arranged at the bottom of the prefabricated pier stud 1, the foot seats 8 are connected with the foundation bearing platform 2 through the plurality of energy consumption connecting pieces 9, and the plurality of energy consumption connecting pieces 9 are distributed along the vertical center line of the prefabricated pier stud 1 in a centrosymmetric manner; both ends of the first prestressed tendon 3 are anchored on the upper surface of the foot seat 8, and the middle part of the first prestressed tendon 3 is positioned in the foundation bearing platform 2.
Specifically, the problem that the pier corner part of the prefabricated pier stud 1 is damaged and broken due to stress concentration can be effectively prevented by arranging the foot seat 8, and accordingly stress loss caused by local extrusion of a concrete structure at the bottom of the prefabricated pier stud 1 is reduced. During actual construction, the foot base 8 and the prefabricated section at the bottommost layer of the prefabricated pier stud 1 can be set to be an integrated structure, namely when the prefabricated pier stud 1 is of a columnar structure, the foot base 8 is also of the columnar structure, the foot base 8 and the prefabricated pier stud 1 have the same sectional shape, but the sectional area of the foot base 8 is larger than that of the prefabricated pier stud 1. The foot base 8 can be made of high-strength or high-performance concrete, and a steel pipe can be wrapped on the periphery of the foot base 8 to prevent the concrete at the bottom joint of the prefabricated pier stud 1 from being seriously crushed in the lateral swinging process.
Meanwhile, the plurality of energy-consuming connecting pieces 9 are distributed in a centrosymmetric manner along the vertical center line of the prefabricated pier stud 1, so that the consistency of energy consumption of all parts along the periphery of the foot seat 8 can be ensured.
In addition, both ends of the first prestressed tendons 3 are anchored on the upper surface of the foot seats 8, the middle parts of the first prestressed tendons 3 are positioned in the foundation bearing platform 2, and the arrangement of the first prestressed tendons 3 is designed, so that not only can the two ends of the first prestressed tendons 3 be conveniently anchored, but also no matter the prefabricated pier stud 1 moves or swings towards any direction under the action of an earthquake, at least one end of the first prestressed tendons 3 can generate stress in time and rapidly conduct the stress to the foundation bearing platform 2, and therefore the prefabricated pier stud 1 can be favorably supported to swing with a larger turning radius, and the anti-overturning capacity of the assembled pier is enhanced.
In one preferred embodiment, a first embedded pipeline 5 is correspondingly arranged on the first prestressed tendon 3; as shown in fig. 1 and 2, the first embedded pipeline 5 includes a first straight line segment, a U-shaped segment and a second straight line segment, the first straight line segment and the second straight line segment are embedded in the foot base 8 in advance, the U-shaped segment is embedded in the foundation bearing platform 2, two ends of the U-shaped segment are located on the upper surface of the foundation bearing platform 2, upper ends of the first straight line segment and the second straight line segment are located on the upper surface of the foot base 8, and lower ends of the first straight line segment and the second straight line segment are located on the lower surface of the foot base 8 and correspond to two ends of the U-shaped segment respectively; first prestressing tendons 3 are unbonded prestressing tendons, and first prestressing tendons 3 passes first pre-buried pipeline 5, and the both ends of first prestressing tendons 3 stretch out and the anchor at the upper surface of foot rest 8 from the both ends of first pre-buried pipeline 5.
Specifically, the arrangement path of the first prestressed tendons 3 is further optimized by arranging the first embedded pipelines 5, and deformation support is provided for the first prestressed tendons 3, so that the stress is greatly conveniently transmitted on the first prestressed tendons 3, and the self-resetting property and the anti-overturning property of the prefabricated pier stud 1 are ensured. It should be noted that, in order to further improve the self-resetting property and the anti-overturning property of the prefabricated pier stud 1, a plurality of first pre-stressed tendons 3 and corresponding first pre-buried pipelines 5 can be arranged, but it should be ensured that the axial symmetry line of each first pre-buried pipeline 5 coincides with the vertical center line of the prefabricated pier stud 1.
Preferably, as shown in fig. 4, the energy consumption connecting member 9 in this embodiment includes an energy consumption rod 91, the energy consumption rod 91 is vertically disposed, the upper end of the energy consumption rod 91 is connected to the foot base 8, and the lower end is connected to the foundation platform 2.
In particular, the dissipative element 91 is preferably a metal rod which is easily deformed by recovery, such as a steel rod or a titanium alloy rod. Through setting power consumption stick 91 to vertical arrangement, both be convenient for realize being connected between foot stool 8 and the basic cushion cap 2, be convenient for prefabricated pier stud 1 again and take place compression deformation at the side direction in-process that sways, from this through the potential energy that power consumption stick 91 consumed at deformation in-process to supplementary prefabricated pier stud 1 is from restoring to the initial position under the stress of first prestressing tendons 3 and second prestressing tendons 4, and prevent that the mound angle position of prefabricated pier stud 1 from damaging the breakage because of stress concentration.
Preferably, as shown in fig. 4, the present embodiment further includes: a fixed backing plate 92, a third embedded pipeline 94 and an anchoring part; the fixed backing plate 92 is pre-embedded on the upper surface of the foot base 8, a third pre-embedded pipeline 94 is vertically pre-embedded in the foot base 8, and an anchoring part is pre-embedded in the foundation bearing platform 2; the diameter of the energy consumption rod 91 is smaller than the inner diameter of the third embedded pipeline 94, the energy consumption rod is inserted into the third embedded pipeline 94, the upper end of the energy consumption rod 91 is connected with the fixed backing plate 92, and the lower end of the energy consumption rod 91 is in threaded connection with the anchoring piece.
Specifically, the anchor assembly includes embedded joint 95 and anchor head 96, and wherein, embedded joint 95 can adopt the screw sleeve, and anchor head 96 can adopt the embedded steel bar of 90 crotch forms, and the length of embedded steel bar can carry out the adaptability according to the requirement of anchor power and set up to can be connected the lower extreme of screw sleeve and the one end that its crotch was kept away from to the embedded steel bar, and pre-buried in basic cushion cap 2 together. When the energy consumption connecting piece 9 is assembled, the lower end of the energy consumption rod 91 is in threaded connection with the upper end of the threaded sleeve, and the upper end of the energy consumption rod 91 is connected with the fixed base plate 92.
Meanwhile, as shown in fig. 4, the energy consumption rod 91 includes a middle section and two threaded connection sections, the two threaded connection sections are disposed at two ends of the middle section, the diameter of the threaded connection section is larger than that of the middle section, and the diameter of the middle section is smaller than the inner diameter of the third embedded pipeline 94, so that a certain gap is formed between the middle section of the energy consumption rod 91 and the third embedded pipeline 94 along the radial direction, and the energy consumption rod 91 is facilitated to have a sufficient space for compression deformation.
In addition, fig. 5 specifically illustrates a fixing mat 92 in the shape of a rectangular ring structure, the edge of the inner ring of the fixing mat 92 is fitted to the periphery of the prefabricated pier stud 1, and the edge of the outer ring of the fixing mat 92 is fitted to the periphery of the foot base 8 in shape. A plurality of first through holes 921 arranged along the circumferential direction thereof are opened on the fixed shim plate 92.
As shown in fig. 4 and 5, a first thread sinking groove 922 corresponding to the first through hole 921 is formed in the front end surface of the fixing base plate 92, and the first thread sinking groove 922 is in threaded connection with the brim of the first fixing cap 98, wherein the first fixing cap 98 is cylindrical and has an open structure below, so that the upper end of the energy consumption rod 91 extends out from the upper side of the fixing base plate 92 after passing through the first through hole 921 and is fastened by the lock nut 97, and meanwhile, the upper end of the energy consumption rod 91 extends into the first fixing cap 98 and abuts against the top of the first fixing cap 98. Therefore, the first fixing cap 98 can effectively prevent rainwater and other external impurities from entering the third embedded pipeline 94 to corrode the third embedded pipeline 94 and the energy consumption rod 91, and can limit the upper end of the energy consumption rod 91, so that the stability of the installation structure of the energy consumption rod 91 in the deformation and energy consumption process is ensured. It should be noted here that in order to implement the waterproof and antirust treatment on the two anchoring ends of the first tendon 3, a second through hole 924 and a second thread sunken groove 925 corresponding to the anchoring end of the first tendon 3 may be provided on the fixing base plate 92, and a corresponding second fixing cap 99 may be installed in the second thread sunken groove 925 to protect the anchoring end of the first tendon 3.
As shown in fig. 6 and 7, when the fixing pad 92 is embedded in the upper surface of the foot base 8, a plurality of threaded counter bores 923 arranged along the circumferential direction of the fixing pad 92 are formed in the back end face of the fixing pad 92, each threaded counter bore 923 is adapted to an embedded bolt 93, and the embedded bolt 93 is embedded in the foot base 8 along the direction of the vertical center line, so that the fixing pad 92 can be embedded in the upper surface of the foot base 8.
It should be noted that, in the structure shown in fig. 3, the prefabricated pier stud 1 is also provided with a foot seat 8 at the top, and the foot seat 8 and the prefabricated capping beam 7 can be connected by using the energy consumption connector 9 and the first tendon 3 as shown in fig. 4.
Preferably, as shown in fig. 8, this embodiment further provides a construction method of the self-resetting precast assembled pier, including: s1, preparing prefabricated pier studs and foundation bearing platforms; s2, hoisting the prefabricated pier stud on a foundation bearing platform, ensuring that a first straight line section and a second straight line section of the first embedded pipeline respectively correspond to two ends of a U-shaped section of the first embedded pipeline, and ensuring that the lower end of a third embedded pipeline corresponds to an anchoring piece; s3, penetrating the first prestressed tendons into the first embedded pipeline, extending the two ends of the first prestressed tendons out of the two ends of the first embedded pipeline and anchoring the first prestressed tendons on the fixing base plate, inserting the energy consumption rods into the third embedded pipeline, connecting the lower ends of the energy consumption rods with anchoring parts in a threaded mode, and fastening the upper ends of the energy consumption rods on the fixing base plate.
Specifically, during actual construction, the prefabricated pier stud can be manufactured in a prefabricated field near a factory or a construction field, prefabrication of all prefabricated sections corresponding to the prefabricated pier stud is performed in the prefabricated field, all embedded parts are fixed in positions after a reinforcement cage and an assembly template are bound, second embedded pipelines are fixed in corresponding positions in the reinforcement cage, for the prefabricated section at the bottommost layer of the prefabricated pier stud, a first straight line section, a second straight line section and a third embedded pipeline of the first embedded pipeline are embedded in a foot seat, a fixing base plate is fixedly connected to the upper surface of the first embedded pipeline through embedded bolts, after all the embedded parts are installed, concrete is poured into the assembly template, and the prefabricated pier stud is maintained to the designed strength.
As shown in fig. 9, the foundation bearing platform can be prefabricated in advance or poured in the construction site, and when the foundation bearing platform is manufactured, the U-shaped section and the anchoring piece of the first embedded pipeline can be embedded in the foundation bearing platform in the same manner.
Then, the prefabricated pier stud is conveyed to a construction site, the second prestressed tendons penetrate into a second embedded pipeline of the prefabricated segment at the bottommost part of the prefabricated pier stud in advance, the lower end of the second prestressed tendons is anchored, the prefabricated segment is hoisted on a foundation bearing platform, the first straight line section and the second straight line section of the first embedded pipeline are ensured to be corresponding to the two ends of the U-shaped segment of the first embedded pipeline respectively, and the lower end of the third embedded pipeline is ensured to be corresponding to the anchoring part.
And then, penetrating the first prestressed tendons into the first embedded pipeline, extending the two ends of the first prestressed tendons out of the two ends of the first embedded pipeline and anchoring the first prestressed tendons on the fixed base plate, inserting the energy consumption rods into the third embedded pipeline, connecting the lower ends of the energy consumption rods with anchoring parts in a threaded manner, and fastening the upper ends of the energy consumption rods on the fixed base plate.
And finally, sequentially and upwards installing other prefabricated sections of the prefabricated pier column layer by layer, injecting cement mortar into the second embedded pipe after the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, anchoring the upper end of the second prestressed tendon at the top of the prefabricated pier column, and finishing.
Therefore, the construction method based on the self-resetting prefabricated assembled pier provided by the embodiment has the advantages that during construction, the whole construction process is convenient to operate, the construction efficiency is high, the assembled pier after construction has self-resetting performance and good anti-overturning performance, the problem that the pier corner part of the existing assembled pier is easy to damage and break due to stress concentration is effectively solved, and the damaged part is easy to repair.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a pier is assembled from prefabrication that restores to throne, includes prefabricated pier stud and basic cushion cap, its characterized in that still includes: the first prestressed tendon and the energy-consuming connecting piece; the bottom of the prefabricated pier stud and the foundation bearing platform are respectively connected into a whole through the first prestressed tendons and the energy-consuming connecting pieces.
2. The self-resetting precast pier assembly according to claim 1,
the prefabricated pier column comprises a plurality of prefabricated pier columns, a carrying structure is arranged on the upper side of each prefabricated pier column, and the top of each prefabricated pier column and the carrying structure are connected into a whole through the first prestressed tendons and the energy-consuming connecting pieces respectively;
and/or, second prestressed tendons arranged along the long side direction of the prefabricated pier column are arranged in the prefabricated pier column, and the prefabricated pier column comprises a plurality of prefabricated sections.
3. The self-resetting precast pier construction according to claim 2,
one end of the first prestressed tendon is anchored on the prefabricated pier stud, the other end of the first prestressed tendon passes through the foundation bearing platform and is anchored on the side surface of the foundation bearing platform, or both ends of the first prestressed tendon are anchored on the prefabricated pier stud, and at least one section of the middle part of the first prestressed tendon is positioned in the foundation bearing platform.
4. The self-resetting precast pier construction according to claim 2,
the bottom of the prefabricated pier stud is provided with a foot seat, the foot seat is connected with the foundation bearing platform through a plurality of energy-consuming connecting pieces, and the plurality of energy-consuming connecting pieces are distributed in a centrosymmetric manner along the vertical center line of the prefabricated pier stud;
the two ends of the first prestressed tendon are anchored on the upper surface of the foot seat, and the middle part of the first prestressed tendon is positioned in the foundation bearing platform.
5. The self-resetting precast pier construction according to claim 4,
further comprising: a first pre-buried pipeline; the first embedded pipeline comprises a first straight line section, a U-shaped section and a second straight line section, the first straight line section and the second straight line section are pre-embedded in the foot seats, the U-shaped section is embedded in the foundation bearing platform, two ends of the U-shaped section are located on the upper surface of the foundation bearing platform, the upper ends of the first straight line section and the second straight line section are located on the upper surface of the foot seats, and the lower ends of the first straight line section and the second straight line section are located on the lower surface of the foot seats and respectively correspond to two ends of the U-shaped section;
the first prestressed tendons are unbonded prestressed tendons, the first prestressed tendons penetrate through the first embedded pipeline, and the two ends of the first prestressed tendons extend out of the two ends of the first embedded pipeline and are anchored on the upper surface of the foot base.
6. The self-resetting precast pier construction according to claim 2,
further comprising: the second embedded pipelines are distributed along the long side direction of the prefabricated pier stud; the second embedded pipeline is integrally embedded in the prefabricated pier stud, or the second embedded pipeline comprises a plurality of sections and is respectively embedded in each prefabricated section;
the second prestressed tendons are provided with bonding prestressed tendons, the second prestressed tendons penetrate through the second embedded pipeline, and cement mortar is filled between the second prestressed tendons and the second embedded pipeline.
7. The self-resetting precast pier construction according to claim 4,
the energy consumption connecting piece comprises energy consumption rods which are vertically arranged;
further comprising: the fixing base plate, the third embedded pipeline and the anchoring piece; the fixed base plate is pre-buried on the upper surface of the foot seat, the third pre-buried pipeline is vertically pre-buried in the foot seat, and the anchoring piece is pre-buried in the foundation bearing platform; the diameter of the energy consumption rod is smaller than the inner diameter of the third embedded pipeline and is inserted into the third embedded pipeline, the upper end of the energy consumption rod is connected with the fixed base plate, and the lower end of the energy consumption rod is in threaded connection with the anchoring piece.
8. The self-resetting precast pier construction according to claim 7,
the energy consumption rod is characterized in that the fixed backing plate is provided with a thread sunken groove, the thread sunken groove is in threaded connection with the brim of the fixed cap, and the upper end of the energy consumption rod extends out of the upper side of the fixed backing plate and is abutted against the top of the fixed cap.
9. A construction method of the self-restoration prefabricated pier assembly according to any one of claims 1 to 8, comprising the following steps:
s1, preparing prefabricated pier studs and foundation bearing platforms;
s2, hoisting the prefabricated pier stud on a foundation bearing platform, ensuring that a first straight line section and a second straight line section of the first embedded pipeline respectively correspond to two ends of a U-shaped section of the first embedded pipeline, and ensuring that the lower end of a third embedded pipeline corresponds to an anchoring piece;
s3, penetrating the first prestressed tendons into the first embedded pipeline, extending the two ends of the first prestressed tendons out of the two ends of the first embedded pipeline and anchoring the first prestressed tendons on the fixing base plate, inserting the energy consumption rods into the third embedded pipeline, connecting the lower ends of the energy consumption rods with anchoring parts in a threaded mode, and fastening the upper ends of the energy consumption rods on the fixing base plate.
10. The construction method according to claim 9,
s2 further includes: penetrating a second prestressed tendon into a second embedded pipeline of the prefabricated section at the bottommost part of the prefabricated pier column in advance, anchoring the lower end of the second prestressed tendon, and hoisting the prefabricated section on a foundation bearing platform;
s3 further includes: and (3) upwards installing other prefabricated sections of the prefabricated pier column layer by layer in sequence, injecting cement mortar into the second embedded pipe after the upper end of the second prestressed tendon passes through the second embedded pipe in each prefabricated section, and anchoring the upper end of the second prestressed tendon at the top of the prefabricated pier column.
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